Hand-Picked Daily GUN DEALS, and Exclusive Coupons Codes >>>

[Build Guide] Block 1.5 SOPMOD M4: America’s Workhorse

Want to clone one of the best known M4 configurations? We've got you covered with our complete build list for the Block 1.5 SOPMOD.

In today’s market, building an AR-15 is as open-ended as decorating your home.

Thousands of aftermarket parts make the potential combinations nearly limitless.

SOPMOD 1.5 Clone
The Block 1.5 SOPMOD M4 Clone

For some, however, the Build-A-Bear Workshop mentality is boring and are taking a different route.

The building of civilian rifles with the intention of replicating a modern military firearm, or simply “Cloning” by those in the community.

To summarize cloning as simply as possible, it is LARPing but with real guns.

If you would like to dive down that rabbit hole and learn the details of cloning I highly suggest reading CLONING DONE RIGHT: Building America’s Rifle by Jeff Gurwitch, a SOF veteran and prominent member of the online cloning community.

What is the 1.5?

In a nutshell, the Block 1.5 PR (Phased Replacement) is an old dog that has learned some new tricks.

The Block 1.5 in action

It is a very “plain” 14.5” M4 with the SOPMOD Block 2 accessory suite on it. The base rifle is extremely boring, nothing about it has the “wow factor” by today’s standards. But, the rifle is proven and does the job needed.

Build List

For the puritans out there, this build is definitely not 100% “clone correct”, there are a few parts I did not have or were unable to find.

Colt 14.5" UpperEOTech 553 Holographic Sight
SureFire 3 Prong Flash HiderPEQ-25 IR Laser
KAC RAS Rail SystemInsight Dual Switch
UTG Tri-Rail ExtensionSureFire RC2 Suppressor
Colt 6920 Complete Lower

Now onto the fun part, the build list.

SOPMOD 1.5 Clone (2)
Our Clone…

Block 1.5 PR’s have been used in all branches military over the last several years, each unit and time period usually has them set up slightly differently.

For this build, I wanted to try and emulate the 1.5’s seen in the 75th Ranger Regiment around the 2011-2013 time frame.

US Rangers, Afghanistan, 2012
US Rangers, Afghanistan, 2012

The upper is a military surplus Colt 14.5” with Gov profile barrel. These things can be tricky to get a hold of but any Colt made 14.5” upper will do.

at Brownells

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

The muzzle device is a SureFire 3 Prong Flash hider that is pinned onto the barrel. Thanks, NFA.

at Brownells

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Now for the time period I was basing this build off of a KAC NT4 is the correct mount.

I do plan on acquiring an NT4 suppressor to cap this build off, but until then the SureFire RC2 will have to do.

surefire socom556 rc2
SureFire SOCOM 5.56 RC2 in FDE

On the upper, I have a KAC RAS rail system and UTG tri-rail extension on the front sight post.

at Optics Planet

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Again I had to cut a corner here. The Yankee Hill Machine tri-rail extension is what is correct for this build, but they have long since been discontinued and I have been unsuccessful at finding one.

at Optics Planet

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

The UTG is a total rip off of the YHM so it will work until I can source the original.

SOPMOD Rifle (2)
Different stock, also rocking the magnifier!

The lower is a complete Colt 6920 purchased from Brownells, with a B5 SOPMOD stock.

at Brownells

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

And that is it for the base rifle.

SOPMOD 1.5 Clone (4)
The Block plus the Glock

Minus accessories the base rifle was only $900 to assemble.

The optic I chose for this build is a SU-231 marked EOTech 553.

Unfortunately, EOTech has stopped all support for the 553, so once this optic breaks or dies there is no reviving it.

SOPMOD 1.5 Clone (3)
EOTech SU-231 553 Holographic Sight

The light is an M3X with an LED upgrade kit, again not accurate for this build but the stock incandescent M3X bulb is absolutely terrible.

I’m pretty sure the stock bulb is so dim it actually makes the night darker.

Lastly is the PEQ-15 IR laser and Insight dual switch.

at Optics Planet

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Definitely, an expensive accessory to have but worth it if you have any kind of night vision.

Parting Shots

Honestly, half the fun of cloning is hunting down all the parts and scouring the interwebs for reference pictures.


The accessories needed for most clone builds are not commercially available and sometimes require months of digging to find.

If you are looking to start a clone build of your own the CRA facebook group is a great place to start.

It is the largest clone group on Facebook and most members are happy to answer questions and point people in the right direction.

Want to hear more about clone builds? Got a clone you want to show off? Let us know in the comments! If you’re looking for some awesome SWAG, take a look at MOE Guns Tactical! Need the best AR upgrades without enlisting? Take a look at our Best AR-15 Upgrades to get started!

The Best Gun Deals, Coupons and Finds

Subscribe to Pew Pew Tactical's sales and deals email.

2 Leave a Reply

  • Commenter Avatar

    Great article, thanks!

    April 12, 2022 10:36 am
  • Commenter Avatar
    Dylan Beaird

    Did you paint the Knights Armament rail? If so what did you use?

    June 7, 2021 5:03 pm
Join the community! Log in
Please provide a valid email address.
Password is required.
Please provide a valid display name.
Please provide a valid email address.
The password should contain at least 8 characters with at least one number or special character.
Please accept in order to continue.
Trouble logging in?
Type your email address and we’ll send you a link to reset your password.
Please provide a valid email.
Type your new password and hit button below to confirm it.
Field is required.
Account already exists
We already have an account registered for email address () which is linked to your Facebook account.
To log in type your Pew Pew Meter password below.
Field is required.
Account already exists
We noticed that you have previously logged in with your Account which is linked to the same email address () - we can link both of your accounts together.
In order to link your accounts, hit button below and log in to your Account with the same email as above.

Account in Pew Pew Meter means more

Check what do you get by creating an account
Check and save your reviews!
Bookmark and compare your favorite firearms
Manage your newsletter subscription
pew pew tactical logo

new here?

Personalize your experience.
Select what level shooter you are!

pew pew tactical logo

level up your gun knowledge

Thanks! We'll send you the latest guides and training tips geared towards your level.

pew pew tactical logo


You'll now receive newsletters of our best articles on techniques, guns & gear.

$47 value

yours free!

targets targets

practice targets

printer icon printable

our 9 favorite targets and drills


practice targets

printer icon printable

enter your email to download

We'll only use the information provided according to our privacy policy.

success icon

Ready to Download

Click below to begin your download

download pdf